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This commit is contained in:
Saikari
2026-02-20 02:53:20 +03:00
parent 0546272493
commit f363fa6f1a
1 changed files with 36 additions and 23 deletions
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59
examples/example_barycentric.cpp
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@@ -14,26 +14,32 @@ static const char* vertexShaderSource = R"(
layout (location = 0) in vec3 aPos; layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aColor; layout (location = 1) in vec3 aColor;
layout (location = 2) in float aPointSize; layout (location = 2) in float aPointSize;
layout (location = 3) in float aIsLine;
out vec3 vColor; out vec3 vColor;
out float vIsLine;
void main() { void main() {
gl_Position = vec4(aPos, 1.0); gl_Position = vec4(aPos, 1.0);
vColor = aColor; vColor = aColor;
gl_PointSize = aPointSize; gl_PointSize = aPointSize;
vIsLine = aIsLine;
} }
)"; )";
static const char* fragmentShaderSource = R"( static const char* fragmentShaderSource = R"(
#version 330 core #version 330 core
in vec3 vColor; in vec3 vColor;
in float vIsLine;
out vec4 FragColor; out vec4 FragColor;
void main() { void main() {
// Calculate distance from center of the point if (vIsLine < 0.5) {
vec2 coord = gl_PointCoord - vec2(0.5); // Calculate distance from center of the point
if(length(coord) > 0.5) vec2 coord = gl_PointCoord - vec2(0.5);
discard; if(length(coord) > 0.5)
discard;
}
FragColor = vec4(vColor, 1.0); FragColor = vec4(vColor, 1.0);
} }
@@ -61,10 +67,12 @@ void drawChar(char c, float x, float y, float scale, const Vector3<float>& color
lines.push_back(x + x1*w); lines.push_back(y + y1*h); lines.push_back(0.0f); lines.push_back(x + x1*w); lines.push_back(y + y1*h); lines.push_back(0.0f);
lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z); lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z);
lines.push_back(1.0f); // size lines.push_back(1.0f); // size
lines.push_back(1.0f); // isLine
lines.push_back(x + x2*w); lines.push_back(y + y2*h); lines.push_back(0.0f); lines.push_back(x + x2*w); lines.push_back(y + y2*h); lines.push_back(0.0f);
lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z); lines.push_back(color.x); lines.push_back(color.y); lines.push_back(color.z);
lines.push_back(1.0f); // size lines.push_back(1.0f); // size
lines.push_back(1.0f); // isLine
}; };
switch(c) { switch(c) {
@@ -155,6 +163,7 @@ int main() {
pointCloud.push_back(P.x); pointCloud.push_back(P.y); pointCloud.push_back(P.z); pointCloud.push_back(P.x); pointCloud.push_back(P.y); pointCloud.push_back(P.z);
pointCloud.push_back(u); pointCloud.push_back(v); pointCloud.push_back(w); pointCloud.push_back(u); pointCloud.push_back(v); pointCloud.push_back(w);
pointCloud.push_back(2.0f); // size pointCloud.push_back(2.0f); // size
pointCloud.push_back(0.0f); // isLine
} }
} }
} }
@@ -165,25 +174,29 @@ int main() {
glBindVertexArray(VAO_cloud); glBindVertexArray(VAO_cloud);
glBindBuffer(GL_ARRAY_BUFFER, VBO_cloud); glBindBuffer(GL_ARRAY_BUFFER, VBO_cloud);
glBufferData(GL_ARRAY_BUFFER, pointCloud.size() * sizeof(float), pointCloud.data(), GL_STATIC_DRAW); glBufferData(GL_ARRAY_BUFFER, pointCloud.size() * sizeof(float), pointCloud.data(), GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0); glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(3 * sizeof(float))); glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1); glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(6 * sizeof(float))); glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2); glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(7 * sizeof(float)));
glEnableVertexAttribArray(3);
GLuint VAO_dyn, VBO_dyn; GLuint VAO_dyn, VBO_dyn;
glGenVertexArrays(1, &VAO_dyn); glGenVertexArrays(1, &VAO_dyn);
glGenBuffers(1, &VBO_dyn); glGenBuffers(1, &VBO_dyn);
glBindVertexArray(VAO_dyn); glBindVertexArray(VAO_dyn);
glBindBuffer(GL_ARRAY_BUFFER, VBO_dyn); glBindBuffer(GL_ARRAY_BUFFER, VBO_dyn);
glBufferData(GL_ARRAY_BUFFER, 1000 * 7 * sizeof(float), NULL, GL_DYNAMIC_DRAW); glBufferData(GL_ARRAY_BUFFER, 1000 * 8 * sizeof(float), NULL, GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0); glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(3 * sizeof(float))); glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1); glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (void*)(6 * sizeof(float))); glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2); glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(7 * sizeof(float)));
glEnableVertexAttribArray(3);
glEnable(GL_PROGRAM_POINT_SIZE); glEnable(GL_PROGRAM_POINT_SIZE);
glEnable(GL_BLEND); glEnable(GL_BLEND);
@@ -197,7 +210,7 @@ int main() {
// Draw the point cloud (the iterated points) // Draw the point cloud (the iterated points)
glBindVertexArray(VAO_cloud); glBindVertexArray(VAO_cloud);
glDrawArrays(GL_POINTS, 0, pointCloud.size() / 7); glDrawArrays(GL_POINTS, 0, pointCloud.size() / 8);
// Animate the white dot to simulate dragging // Animate the white dot to simulate dragging
float t = glfwGetTime(); float t = glfwGetTime();
@@ -231,22 +244,22 @@ int main() {
std::vector<float> dynData = { std::vector<float> dynData = {
// Lines from P to A, B, C // Lines from P to A, B, C
P.x, P.y, P.z, u, v, w, 1.0f, P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, 1.0f, A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f, P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, 1.0f, B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
P.x, P.y, P.z, u, v, w, 1.0f, P.x, P.y, P.z, u, v, w, 1.0f, 1.0f,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, 1.0f, C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
// The animated dot itself (White) // The animated dot itself (White)
P.x, P.y, P.z, 1.0f, 1.0f, 1.0f, sizeP, P.x, P.y, P.z, 1.0f, 1.0f, 1.0f, sizeP, 0.0f,
// The 3 corner dots // The 3 corner dots
A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, sizeA, A.x, A.y, A.z, 1.0f, 0.0f, 0.0f, sizeA, 0.0f,
B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, sizeB, B.x, B.y, B.z, 0.0f, 1.0f, 0.0f, sizeB, 0.0f,
C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, sizeC C.x, C.y, C.z, 0.0f, 0.0f, 1.0f, sizeC, 0.0f
}; };
char bufA[16], bufB[16], bufC[16]; char bufA[16], bufB[16], bufC[16];
@@ -271,7 +284,7 @@ int main() {
glDrawArrays(GL_LINES, 0, 6); glDrawArrays(GL_LINES, 0, 6);
// Draw text lines // Draw text lines
int numTextVertices = (dynData.size() / 7) - 10; int numTextVertices = (dynData.size() / 8) - 10;
if (numTextVertices > 0) { if (numTextVertices > 0) {
glDrawArrays(GL_LINES, 10, numTextVertices); glDrawArrays(GL_LINES, 10, numTextVertices);
} }